Property isExclusive is wrong in formatRange documentation

### Reduced Test Case

[codepen.io](https://codepen.io/BdeuxR/pen/OJbYmVG)

### Bug Description

In the documentation [formatRange](https://fullcalendar.io/docs/formatRange) & [Calendar::formatRange](https://fullcalendar.io/docs/Calendar-formatRange) the property `isExclusive` doesn't work.

I've debugged to know why and I've find out that the name of the property is `isEndExclusive`.